German-born, American defender who joined Hertha BSC in 2012 and became a member of the US national team in 2013.
He spent a year in the Hertha BSC youth system, then another year playing for the club's second squad before joining the senior team.
He entered his first World Cup competition with the US national team in 2014.
He was born in Berlin, Germany.
He became teammates with Matt Besler on the US national team in 2013.